CentOS允许telnet通过root用户进行访问

[root@clovem ~]# yum install telnet-server -y  //安装telnet服务端[root@clovem ~]# cat /etc/xinetd.d/telnet     //开启telnet的托管服务# default: on# description: The telnet server serves telnet sessions; it uses \#unencrypted username/password pairs for authentication.service telnet{flags= REUSEsocket_type= streamwait= nouser= rootserver= /usr/sbin/in.telnetdlog_on_failure+= USERIDdisable= no                              //将yes改为no}[root@clovem ~]# service xinetd restart          //重启托管服务使配置文件生效

[root@clovem ~]# mv /etc/securetty /etc/securetty.bak

[root@rawlnx ~]# cat /etc/xinetd.d/krb5-telnet# default: off# description: The kerberized telnet server accepts normal telnet sessions, \# but can also use Kerberos 5 authentication.service telnet{flags= REUSEsocket_type= streamwait= nouser= rootserver= /usr/kerberos/sbin/telnetdlog_on_failure+= USERIDdisable= no}

-bash-3.00# cat /etc/default/login |grep CONSOLE# If CONSOLE is set, root can only login on that device.#CONSOLE=/dev/console